On running the last set of GISS temperature data through my spreadsheet, I noticed that they had added 0.03C, or more, of warming onto their numbers for January through to October 2012. For instance, January was 0.32C, and has been changed to 0.36C.

I cannot tell specifically when the numbers were changed, but the fact that October has been changed suggests that the changes were made in the last two months.

The net result is that the anomaly for the whole year is 0.56C, instead of 0.53C.